New 4G LTE CellSpot – Powerful network signals for mobile devices.

T-Mobile is now offering 4G LTE CellSpot devices to its Simple Choice phone plan customers to improve the indoor 4G LTE signals they receive for their cellular devices, building on its earlier Un-Carrier 7.0 efforts to improve indoor coverage using WiFi.

The technology builds on T-Mobile’s Un-carrier 7.0 announcement back in September 2014, when it unveiled its WiFi CellSpot router devices for customers so they could use their home or business WiFi networks to make WiFi calls using their T-Mobile accounts.

The 4G LTE CellSpot devices—which essentially are small cells—use the LTE network directly and don’t provide WiFi services to users like the WiFi CellSpot devices do. The latest devices, which are 3G, 4G and VoLTE-capable, provide all of the usual 4G LTE services, including voice over LTE (VoLTE), HD voices, advanced messaging, video calling and more, according to T-Mobile. T-Mobile customers can connect to the devices automatically just like any other cell tower, with no passwords or log-ins required.

T-Mobile says that about 1 million WiFi CellSpot Routers are in use by customers since they were introduced last year, and they are used to make more than 11 million calls each day using WiFi.

The physical hardware for the T-Mobile 4G LTE CellSpot is 8.5 inches wide, 8.5 inches tall and 1.3 inches thick and can be placed in any location for coverage. The device is installed by connecting it to an Internet broadband service and plugging it into a wall socket. It supports up to 16 calls at one time and works with any 3G, 4G or LTE device compatible with T-Mobile’s network, including devices that aren’t capable of WiFi calling, according to the company.

The earlier WiFi CellSpot router program will continue to be offered as well, providing separate WiFi calling services. The latest unit is a small cell that delivers its own wireless signal and does not interfere with customers’ WiFi signals.

The updated Un-carrier 7.0 services were unveiled by T-Mobile just before its upcoming and still secretive Un-carrier X announcement, which is slated for Nov. 10 in Los Angeles. Rumors circulating about Un-carrier X speculate that it will involve free, unlimited video streaming capabilities for customers, similar to what the carrier already began offering following its Music Freedom Un-carrier 6 event in June 2014, according to a eWEEK report.

In May 2015, T-Mobile unveiled its Un-carrier 9 benefits, which were new mobile services targeted directly at small and midsize businesses to bring them into T-Mobile’s ecosystem. Under its Un-carrier for Business, or Un-Carrier 9.0, offering, the company began selling mobile services for $16 per line per month for up to 19 lines of service, with each one including 1GB of high-speed data. Pricing for 20 to 999 lines is $15 per line per month, including 1GB of high-speed data per line, while pricing for 1,000 lines or more is $10 per line per month.

In June 2014, T-Mobile introduced its Un-carrier 6 Music Freedom offering, which allowed customers on its Simple Choice plans to listen to streaming music from Pandora, Rhapsody, iHeartRadio, iTunes Radio, Slacker and Spotify without using their monthly high-speed data allowances. Previously, such streaming would count against a user’s data plan usage.